Content and distribution of RNA, protein, DNA, glycogen and carbohydrate components in spores and vegetative sporeforming stages plasmodium of Henneguya cerebralis were described. Pathohistological changes in head tissus of Thymallus arcticus nigrescens are discussed. The conclusion on the relative youth of parasite system "H. cerebralis--Thymallus arcticus nigrescens" is made.
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